74492

Appears in sequences

• Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) and having k u=(2,1) steps among the steps leading to the first d step.at n=39A108440
• Expansion of 1/( (1-16*x)*(1+4*x)^2 )^(1/4).at n=5A216357
• a(n) is the smallest number that starts a run of exactly n consecutive integers that are neither primes nor semiprimes.at n=13A343729